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A Storz coupling is a quarter-turn internal lug coupling, easy to connect to each other by the force of lugs which are on the inside of the coupling. Storz coupling is widely used by fire services worldwide and was invented for this purpose by Guido Storz in 1882. It is commonly used on fire hoses to connect to fire hydrants in western Europe, esp. Denmark, Germany, Austria, Switzerland, Sweden, and the Netherlands. In some industry usage like agriculture and irrigation, it can be casting made for general hose connection and pressure undertake.

However if it is used in firefighting which is rather demanding, a forged artcraft is always demanded to guarantee the safety and duration of the couplings. As the metal is shaped during the forging process, its internal grain deforms to follow the general shape of the part. As a result, the grain is continuous throughout the part, giving rise to a piece with improved strength characteristics.


Compression type test is thus carried out to check the tensile strength; and snatch test on Storz claws is performed taking casted and forged pieces in comparison, both in line with DIN standard requirements.

Compression test to justify forged tensile strength over casted pieces To squeeze a forged head by hydraulic compression test machine, we did not witness fractures anywhere at the bending areas when the test piece was seriously distorted. That proves the metallurgy fibers are well connected adding to its greater tensile strength that can endure heavier impacts thus promises a secured and longer lifetime resulted from forging fabrication, as in comparison to the casted.

Snatch type test: casted vs forged. In the snatch test, we pulled Storz claws of a casted aluminum-alloy and a forged alloy piece respectively by hydraulic pulling machine.

Claws of the forged-alloy were torn apart as the accumulative force hit 98.4kN when the casted capacity was observed only 35.4kN. The forged structural length was proved 2.8 times greater in the laboratory. Furtherly the broken cross-section makes it visually possible to distinguish the continuous forces happens inside the material proving forging quality over casting ones which is a must in firefighting application.

Storz hose couplings are available with us in forged, casted aluminum, brass, and stainless steel. NBR gasket for both suction and delivery, or delivery only is optional. Check with our sales to make sure of that.

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